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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #21  
Old 06-22-2012
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Re: Epoxy resin and eliminating bubbles

Quote:
Originally Posted by Irunbird View Post
They appear after I apply. I can smooth it all on-- thick like peanut butter as I've done on a keel, or a bit thinner like mayonnaise for the cabin top I'm currently working on. I can take just one look away (like a plane flying overhead), look back, and they're there.
what is the air temp and the cabin top temp . is it in the sun. if it is bubbling after you spread it on then it is heating up from the surface temp being to high. try mixing it even thicker. also the thicker the easier it is to sand and the lighter in weight it is. if you mix it to the same consistancy every time it is easier to fair as there are no hard and soft spots. put it on a dry as you can thick a with one swipe and sand with 40 grit to shape until fair. then go over with the same consistancy and fill the holes then same with 100 grit. paint some epoxy high build primer or squeegy on some resin and wipe off excess with a cloth. this is just to fill the pin holes and sand to 240 for paint primer or gelcoat
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  #22  
Old 06-22-2012
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Re: Epoxy resin and eliminating bubbles

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Originally Posted by travlineasy View Post
The epoxy resin was then mixed, poured on the table's surface, and squeegeed to an even consistency on the entire top. Within a few minutes, bubbles began rising to the surface, thousands of them. The next step, which the first time I did this scared the hell out of me, was to fire up a propane torch and play the flame lightly over the surface. Each and every bubble popped, the finish layed down flat, no dimples were created and the surface dried bubble free. The guy that taught me how to do this said what occurs is the bubble quickly expands and pops before the epoxy is anywhere close to being cured.
This exact technique was discussed favorably in the most recent edition of Epoxyworks, which is provided by West. Here is a link (go to the article entitled Bubble-free Coating). Lots of other good hints in the article, including those already mentioned regarding the temp of the substrate (shout out to Denise):
EPOXYWORKS
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  #23  
Old 06-22-2012
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Re: Epoxy resin and eliminating bubbles

My son and I were going to have a small craft building business about 15 yrs back.. but... well at least I retain the knowledge thanks SV
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Old 06-22-2012
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Re: Epoxy resin and eliminating bubbles

Thanks for the link. I didn't think the chemical compound had changed since I used the torch method, but like I stated, it was several years ago and I wasn't sure.

Cheers,

Gary
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Old 06-23-2012
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Re: Epoxy resin and eliminating bubbles

It is temp. Get your work and workspace as warm as it will be and work and cure on the cool down. I am betting that the side you are working on is oposite a finished/ air tight side?
I have had this issue in the past with several cold molded projects that temp control resolved. Let me know if it works.
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